Abstract Due to the need for better methods to upgrade heavy oil, selective ring opening (SRO) of multi-ring aromatics to mono-aromatics has attracted great interest. The SRO reaction can be done by hydrogenation and hydrocracking, catalyzed by the metallic (from metal element) and acidic (from zeolite) functions of bifunctional catalysts. We investigated the effect of wet-impregnated Ni and W metals over Beta zeolite on the characteristics of metal and acid sites, and found the correlation with their catalytic performance for the SRO reaction of 1-methylnaphthalene as a representative multi-ring aromatics. Primarily, W metal species was estimated to be more active than Ni metal species for the SRO reaction. Based on fundamental insight into these bifunctional catalysts, we described a facile approach to enhance the yield of the SRO reaction employing NiW-loaded Beta zeolite catalysts with various Ni contents. The balance of the metallic and acidic functions was modified by variation of the Ni content, and gradually shifted the product distribution showing a close relationship between the SRO performance and Ni content. We expect that this study can provide a logical perspective for designing selective bifunctional catalysts based on a better understanding of the interaction between metal and zeolite characteristics.

中文翻译：

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1-甲基萘选择性开环在钨负载β沸石催化剂上负载Ni的策略控制

摘要 由于需要更好的方法来升级重油，多环芳烃选择性开环（SRO）到单芳烃引起了极大的兴趣。SRO 反应可以通过加氢和加氢裂化来完成，由双功能催化剂的金属（来自金属元素）和酸性（来自沸石）功能催化。我们研究了湿法浸渍的 Ni 和 W 金属在 Beta 沸石上对金属和酸位特征的影响，并发现了它们对作为代表性多环芳烃的 1-甲基萘的 SRO 反应的催化性能的相关性。首先，据估计，对于 SRO 反应，W 金属物种比 Ni 金属物种更具活性。基于对这些双功能催化剂的基本了解，我们描述了一种使用不同 Ni 含量的负载 NiW 的 Beta 沸石催化剂来提高 SRO 反应产率的简便方法。金属和酸性功能的平衡通过 Ni 含量的变化而改变，并逐渐改变产品分布，显示 SRO 性能和 Ni 含量之间的密切关系。我们希望这项研究可以为基于对金属和沸石特性之间相互作用的更好理解来设计选择性双功能催化剂提供一个合乎逻辑的视角。